I am often asked if a particular stadium has a "hot gun". The following is a list of corrections/offsets that we use in our data.

These #s use a rolling average of 10 games on either side; so, they are not yet nearly as precise at the very start of the season. Additionally, we use 55' (rather than the gameday standard 50') to compute velo, because it is a more accurate reflection of where the pitcher releases the ball.

For the following table, a negative mph number indicates a cool gun and a positive number indicates a hot gun.

You can also see that several stadiums have relatively large positive values for pfx_x, which indicates that movement is shifted right from the catcher's POV (or left, or negative numbers). Again, these are corrected out of the data displayed on the site.

Because these values change, these values reflect the current corrections applied on 08/20/2014. We also keep historical records on each game's offset for use on our cards and data system.
For more information, please contact dan@brooksbaseball.net

homemphpfx_xpfx_zx0z0axayazvx0vy0vz0
ana 0.482 -0.911 0.88 0.103 -0.07 -1.437 1.823 1.52 0.245 -0.699 -0.405
ari 0.104 0.038 0.119 0.046 -0.062 0.047 -1.23 0.253 -0.083 -0.146 -0.506
atl -0.389 0.092 -0.193 -0.118 -0.022 0.271 -1.815 -0.328 0.24 0.572 0.08
bal -0.439 0.323 0.342 0.296 0.144 0.632 -0.981 0.492 -0.738 0.63 -0.287
bos -0.038 1.36 0.894 0.088 -0.097 2.234 -0.151 1.472 -0.675 0.048 -0.304
cha 0.632 -1.104 0.386 0.055 0.011 -1.899 1.187 0.667 0.404 -0.92 -0.218
chn -0.483 -1.277 0.327 -0.159 -0.035 -2.189 -1.183 0.481 0.983 0.707 -0.125
cin 0.027 0.783 0.053 -0.129 0.002 1.404 -1.72 0.134 0.128 -0.032 -0.357
cle -0.083 0.207 -0.522 -0.14 0.043 0.326 -2.224 -0.835 0.059 0.116 -0.283
col 0.512 1.48 -1.662 0.058 -0.103 2.61 -2.767 -2.821 -0.442 -0.8 0.594
det -0.193 -0.306 0.206 -0.09 -0.063 -0.584 -1.635 0.395 0.419 0.288 -0.214
flo -0.104 0.889 -0.15 -0.006 -0.153 1.528 -0.087 -0.206 -0.321 0.146 0.318
hou 0.279 2.086 0.445 0.221 -0.087 3.461 2.682 0.733 -1.153 -0.438 0.061
kca -0.286 -1.186 0.422 0.235 -0.144 -2.023 -0.887 0.609 -0.019 0.421 -0.184
lan 0.409 -0.733 -0.302 0.128 -0.122 -1.374 0.221 -0.463 0.195 -0.593 0.082
mia -0.54 0.094 0.523 0.134 0.022 0.255 1.136 0.758 -0.459 0.79 -0.357
mil -0.214 -0.069 -0.067 0.198 0.067 0.006 -0.709 -0.23 -0.341 0.306 -0.278
min -0.2 1.165 -0.199 0.028 0.089 2.185 -1.592 -0.399 -0.475 0.272 -0.283
nya -0.063 -0.254 0.364 -0.042 -0.111 -0.351 -0.894 0.669 -0.303 0.085 -0.091
nyn -0.056 0.393 -0.804 -0.293 0.011 0.812 1.662 -1.406 0.482 0.086 0.111
oak -0.446 0.674 -0.026 0.016 0.017 1.133 -2.056 -0.1 -0.435 0.633 -0.158
phi 0.303 -1.718 0.54 -0.047 0.03 -2.849 1.836 0.878 0.345 -0.429 -0.484
pit -0.336 0.801 -0.57 -0.097 -0.106 1.419 -0.83 -1.033 0.101 0.48 0.344
sdn -0.103 1.386 -0.165 0.18 -0.098 2.41 -0.061 -0.291 -1.126 0.117 0.165
sea 0.322 -0.225 -4.697 -0.011 -0.366 -0.35 1.667 -7.963 0.024 -0.521 2.38
sfn 0.4 0.054 -0.413 -0.065 0.047 0.187 -1.061 -0.607 -0.178 -0.587 -0.236
sln -0.08 -1.757 -0.217 -0.032 0.01 -3.01 1.086 -0.529 0.45 0.128 0.054
tba -0.5 2.688 0.62 0.22 -0.071 4.385 1.78 0.866 -1.133 0.707 0.029
tex -0.292 -0.173 0.516 -0.055 0.082 -0.304 -2.507 0.927 -0.101 0.43 -0.416
tor 0.422 -0.873 -0.367 0.068 -0.093 -1.456 0.802 -0.593 -0.171 -0.651 0.299
was 0.13 -1.013 -0.132 0.151 -0.071 -1.711 0.554 -0.258 0.179 -0.167 -0.123